Note 5 - Income Taxes - Reconciliation of Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
U.S. Federal Statutory Tax Rate	$ (901)	$ (991)
U.S. Federal Statutory Tax Rate, percent	20.90%	20.90%
State and Local Income Taxes, Net of Federal Income Tax Effect	$ 0	$ (293)
State and Local Income Taxes, Net of Federal Income Tax Effect, percent	0.00%	7.00%
Other	$ 0
Other, percent	0.00%
Change in valuation allowance	$ 910	$ 1,636
Change in valuation allowance, percent	(21.20%)	(34.60%)
Global intangible low-taxed income (GILTI)	$ 8
Global intangible low-taxed income (GILTI), percent	(0.20%)
SubPart F	$ 121
SubPart F, percent	(2.80%)
Effective Income Tax	$ 0	$ 3
Effective Income Tax, percent	0.00%	0.00%
Foreign subsidiary		$ (118)
Foreign subsidiary, percent		3.00%
Permanent differences		$ 124
Permanent differences, percent		(3.00%)
Adjustment to prior year taxes		$ (355)
Adjustment to prior year taxes, percent		8.00%
Inland Revenue, Hong Kong [Member]
Foreign rate differential	$ (84)
Foreign rate differential, percent	2.00%
Interest Income	$ (47)
Interest Income, percent	1.10%
Other	$ (12)
Other, percent	0.30%
Change in valuation allowance	$ 5
Change in valuation allowance, percent	(0.10%)